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Energy from the groundwater
Technical addition
Correct planning, possible problems
The mentioned planning steps belong to a row of measures, which are
necessary for a successful and a free-of-trouble functioning of a
ground-water heat pump plant. Further investigations, pre-clarifications
and measures are added if necessary. The most important are specified in
the lists below.
Procedure
- Clarification of the geological-hydraulicgeological conditions as
well as the ground-water protection-technical restrictions.
- Correct placement of withdrawal and return well (groundwater
direction of flow, consideration of already existing plants).
- On effective heat requirement aligned borehole development.
- Sufficient de-sanding of the system.
- Several hours lasting Pumping test .
- Chemical analysis of the groundwater.
- Particularly with scarce groundwater resources: Clarify the
maximally possible heat extraction.
- Regarding the water return: Clarification of the ground permeability
also within upper ground ranges.
Measure catalog
- Under ideal conditions: Standard construction of the groundwater
withdrawal and its - feed-back well.
- With high amount of sand: Usage of a bypass at the system power-on,
usage of simple filter systems, backrinsable filter systems, cyclone
filter, sediment basin, intermediate cycle, heat exchanger,
demand-related stepless groundwater supply, etc.
- With high iron and manganese content: Special filter systems or
oxygen-free running of the plant.
- With aggressive, corrosive composition of the groundwater: Usage of
special, well detachable plant parts from PVC, stainless steel
(chrome-plated steel), intermediate cycle.
- With rare ground-water supply or seasonally strongly varying
groundwater supply-rates: Usage of an intermediate cycle and a heat
exchanger.
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